Census of Population and Housing: Census dictionary
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Boarding school student
Boarders at school or college are specifically asked to record the address of the school or college as their usual residence if they intend to live there for a total of 6 months or more. This instruction was not given in censuses prior to 1986 and often these people incorrectly reported their family home as their place of usual residence.
See also Type of non-private dwelling (NPDD).